Antisiphoning trap.



A. M. MORRISON.

ANTISIPHONING TRAP.

APPLIOA'IIOR FILED JAN. 28, 1902). 988,369.

Patented Apr. 4, 1911.

n4: NOR I Aunnnw M. ivro'nn'rson, or nervous, rowA.

emrsrrnomne rims.

Specification of Letters-Patent.

Patented Apr; 4", flYfI.

Application filed January 28, 1909. Serial No. 474,688.

To all whom it mG/j concern."

Be it known that Llhnnnrw M-.- MORRISON, a citizen of the United States, and a resident of the city of Dubu-q ie, inthe county of Uubuque and State of Iowa, have invented certainnew anduseful Improvements in Antisiphoning Traps; and I do hereby declare that the following is a full, clear, and exact description of the same, reference bei-ng had to the accompanying drawings, andtothe letters of reference marked thereon, which form a part of this specification.- H

Heretoiiore it has been a very common fault with traps for fluid distribution that, unless carefully revented to afforda very free inflow of air, the flushingof, or discharge from one fixture acts to drain or siphon-the sealingtluid out of the other traps- This permits the escape of sewer gas through the traps thus rendered useless, greatly endangering the health; of those occupying the premises. Inasmuch as the traps affected may be at considerable distances from that flushed, no warning is given of the loss of sealing fluid and in: such imperfectly vented systems, it rarely happens'that any of the traps act to exclude sewer gas and other emanations from thesewer.- Many attempts have been rnade to overcome this difficulty for this purpose traps sealed in part by fluids other than that discharged throughthe trap have been devised; Mercury has been sometimes used for this purpose, thereby notonly' increasing considerably the expense of the construction, but also necessitating frequent inspections to enable the user to ascertain if the trap is successfully operating Such traps have never heretofore been entirely reliable or satisfactory. Furthermore, practically all trapsheretofore constructed soon become useless by evaporation of their contents, destroying the seal unless often 'flushed.

The object of this invention is to afford an antisiphoning trap of exceedingly cheap,-

simple and durable construction and which cannot get out .of repair and in which s1- phoning of contents of the trap to empty the same is absolutely impossible under any and all conditions.

It is a further object of the invention to afford a construction permitting easy and quick installation, and which operates at all times positively to seal the trap from siphoning but permits a free flow of the fluid therethrough during the normal operation of the trap; and also prevents a-l'l' loss of the sealing fluid by evaporation.-

The' invention consistsiu the matters hereinafter described and more fully pointed out and defined in the a ppendcd cl aims;

On the drawings:- Figure 1 is a verticalsection of a bottle trap embodying my invention.- F 2 asection taken on line 4l-'4l of Fig.- 1.- Fig. 3 is a section on line 5-5 of Fig. 1.

As shownin the drawings/: In the bottle trap shown in Figs, 1, 2,-and 3,- the recep-' tacle or casing comprises a lower andan up'penhemisphere end sect-ion iV-AF, internally threaded at the open end and provided centrally with an axially apertured' externally threaded boss a-a as before de scribed, to receive the out-let pipe 0, andthe inlet pipe B, respectively, the latter of which extends inwardly suiiiciently to afford an upper seat for the ball D, to prevent baclr' flow. Follower nuts 0-42,, are threaded on the bosses as before described.- The middle portion of the casing is formed of a pipe section A, externally threaded at the ends to engage in the end sections. This also may be of cast metal, if preferred.

Supported on aperiplieralring or shoulder 6, near the top of the casing section A, by means of a peripheral flange c ,.is a cup E, of metal, either case or pressed, which is a sufficiently smaller than the casing to afford an open space surrounding the same and which extends to near the bottom of the casing. Said casing is provided with closely arranged apertures around the top thereof o )enin into the casing.

l i: a r.

Threaded into a suitable flange f, in the upper casing member A axially thereof, 1s a cup F, which extends to near the bottom- ,of the cup E, affording considerable space between the same and the sides of said cup- LE, and beneath the bottom, and said botu e e 4 l. tom 15 provided with a central aperture -thereth-rough surrounded by a raised seat f,

on which the ball D, seats when the sealing ,fluicl isdrawn down from any cause.

The operation is as follows: The sealing fluid in the trap extends to a height to permit the water or other sealing liquid to remain in, and fill the receptacle to near or above its middle. The fluid thus supports the ball at all times near the middle of the receptacle. Said ball affords no obstruction to inflowing water or fluid, though it is sufficiently light to be supported from seating as the fluid passes through the trap, thereby permitting a free flow so long as the level of the liquid Within the receptacle is main tained approximately at the same height as its maximum level in the trap C, or cup E. When, however, the level of the liquid is reduced but slightly, as for instance, when the trap begins to siphon, the ball immediately descends upon, and seats to close the discharge aperture, as shown in dotted lines in Fig. 1, completely sealing the same. Obviously, the greater the tendency to siphon, the more firmly will the ball seat, affording a positive valve to break the siphon and prevent any material lowering of the level of the fluid in the receptacle. When the siphon breaks, however, the buoyancy of the ball (due in part to its greater size relative to the discharge aperture and also the slight back flow into the receptacle from the trap tending to restore a level in the receptacle approximating the normal level in the trap) causes the ball to instantly rise to its former position.

The ball serves the double purpose of positively scaling to prevent siphoning of the trap at all times and under any and all conditions and also positively seals the trap to prevent the loss of suflicient of the sealing fluid by evaporation to unseal the trap. This last mentioned result follows from the fact that should any evaporation occur the ball must seat upon the outlet before the seal is broken, thereby closing the same and insuring the retention of suflicient water in the trap to prevent any emanations therefrom. Obviously back flow or flooding is at all times prevented by the sealing of the ball on the end of the inlet pipe B, which extends into the casing for that purpose. Thus an ideal construction is afforded which under all conditions prevents siphoning, the loss of the seal through evaporation and also prevents flooding by back flow. Furthermore, an exceedingly cheap and simple trap is afforded, easy and cheap to manufacture, assemble and install.

Of course, the trap I have shown is merely illustrative for it is obvious that traps of any suitable form such as one-half or quarter 3, or P traps, may be used as effectively as the forms of traps shownin fact, the re ceptacle may assume any desired form, or-

namental or otherwise; may be constructed cation for patent otherwise than necessitated,

by the prior art, as many details of construc tion may be varied without departing from the principles of my invention.

I claim as my invention:

1. A trap comprising a casing having an interior threaded flange and a supporting shoulder, a cup threaded at its upper end in said threaded flange and open at its lower end, an interior seat around the aperture, a float ball in the cup adapted to seat on said seat and a cup disposed between said cup and the casing having a peripheral flange to rest on the supporting shoulder, said cup apertured below the flange.

2. In a device of the class described a casing, an interior threaded flange therein, a supporting shoulder beneath the threaded flange in said casing, a plurality of interfitting cups in the casing, an inner cup threaded at its upper end in the threaded flange in the casing, another cup supported upon the shoulder below the threaded flange, the inner of said cups having an outlet in its bottom, an upturned seat surroundingsaid outlet and peripheral apertures below the top of the outer cup to allow discharge.

3. In a trap, a casing comprising end sec tions and a middle section, a threaded flange in one ofthe end sections and a supporting shoulder in the middle section a cup threaded on the flange of the end section and having an opening at the bottom and a seat formed at the opening, a cup supported by the shoulder within the middle section adapted to receive the aforesaid cup therein and provided with, apertures in the side thereof at the top and a buoyant closure in the cup secured to the end section.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

ANDREI/V M. MORRISON.

Witnesses:

C. W. HILLS, J. W. ANGELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. a 

